They are available from 1/4 to 30 HP and feature the Class F Max Guard insulation system, constant torque operation from 0 to base speed on vector drive and constant horsepower operation to twice the base RPM. Black Max models are priced from $149 to $2,369. Blue Max 2000 vector-duty motors are available from 40 to 100 HP and are designed for inverter or vector applications. The feature the Class H Max Guard insulation system and offer constant horsepower operation to 1.5 times base RPM, as well as constant torque operation from 0 to base speed on vector drive, including TEFC. On V/Hz drives, TEFC motors are limited to 20:1 constant torque. Blue Max motors range from $2,999 to $5,069 in price. Blue Chip XRI inverter-duty motors are available from 40 to 100 HP and meet NEMA premium efficiencies. They feature 10:1 variable torque and 20:1 constant torque on VFD with 1.0 service factor. Blue chip motors offer Class F insulation and continuous duty at 40 degrees C ambient, and are priced from $1,819 to $4,059.